linux-kernel - Re: [PATCH] MIPS: Fix inline asm input/output type mismatch in checksum.h used with Clang

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Message-ID: <20210127210757.GF21002@alpha.franken.de>
Date:   Wed, 27 Jan 2021 22:07:57 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH] MIPS: Fix inline asm input/output type mismatch in
 checksum.h used with Clang

On Wed, Jan 27, 2021 at 12:41:47PM +0800, Tiezhu Yang wrote:
> Fix the following build error when make M=samples/bpf used with Clang:
> 
>   CLANG-bpf  samples/bpf/sockex2_kern.o
> In file included from samples/bpf/sockex2_kern.c:7:
> In file included from ./include/uapi/linux/if_tunnel.h:7:
> In file included from ./include/linux/ip.h:16:
> In file included from ./include/linux/skbuff.h:28:
> In file included from ./include/net/checksum.h:22:
> ./arch/mips/include/asm/checksum.h:161:9: error: unsupported inline asm: input with type 'unsigned long' matching output with type '__wsum' (aka 'unsigned int')
>         : "0" ((__force unsigned long)daddr),
>                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
> 
> This is a known issue on MIPS [1], the changed code can be compiled
> successfully by both GCC and Clang.
> 
> [1] https://lore.kernel.org/linux-mips/CAG_fn=W0JHf8QyUX==+rQMp8PoULHrsQCa9Htffws31ga8k-iw@mail.gmail.com/
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>  arch/mips/include/asm/checksum.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

applied to mips-next.

Thomas.

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